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QCD matrix elements + parton showers: the NLO case

Höche, S.; Krauss, F.; Schönherr, M.; Siegert, F.

QCD matrix elements + parton showers: the NLO case Thumbnail


S. Höche

F. Siegert


We present a process-independent technique to consistently combine next-to-leading order parton-level calculations of varying jet multiplicity and parton showers. Double counting is avoided by means of a modified truncated shower scheme. This method preserves both the fixed-order accuracy of the parton-level result and the logarithmic accuracy of the parton shower. We discuss the renormalisation and factorisation scale dependence of the approach and present results from an automated implementation in the SHERPA event generator using the test case of W -boson production at the Large Hadron Collider. We observe a dramatic reduction of theoretical uncertainties compared to existing methods which underlines the predictive power of our novel technique.


Höche, S., Krauss, F., Schönherr, M., & Siegert, F. (2013). QCD matrix elements + parton showers: the NLO case. Journal of High Energy Physics, 2013(4), Article 027.

Journal Article Type Article
Publication Date Apr 4, 2013
Deposit Date Mar 5, 2013
Publicly Available Date Jul 9, 2014
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2013
Issue 4
Article Number 027
Keywords Monte Carlo simulations, NLO computations.


Published Journal Article (814 Kb)

Copyright Statement
© 2013 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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